A series of stereoisomeric o-methoxy-substituted 2,3-diphenyl propenoic acids and their methyl esters have been synthesized. The E isomers were prepared by a modified Perkin condensation (substituted benzaldehyde, phenylacetic acid, Et3N/acetic anhydride). The difficult to access Z isomers were obtained conveniently in good yields when the appropriate coumarin derivatives were allowed to react with
摘要 合成了一系列立体异构的邻甲氧基取代的2,3-二苯基
丙烯酸及其甲酯。E 异构体通过改进的 Perkin 缩合(取代的
苯甲醛、
苯乙酸、Et3N/
乙酸酐)制备。当合适的
香豆素衍
生物在
DMSO中与KOH和CH 3 I反应时,难于获得的Z异构体可以以良好的产率方便地获得。